Which of the following letter-clusters should replace # and % so that the pattern and relationship followed between the letter-cluster pair on the left side of :: is the same as that on the right side of :: ?
# : MTZ :: KRX : %

Given: # : MTZ :: KRX : %​

Logic: 1st and 3rd three letters are increasing + 5 place.

Now, we check each options.

Option (a): # = HOU, % = PWP (Not Follow)

H + 5 = M, O + 5 = T, U + 5 = Z

K + 5 = P, R + 5 = W, X + 5 $$\neq$$​ P

Option (b): # = YOU, % = PWC (Not Follow)​

Y + 5 $$\neq$$​ M, O + 5 = T, U + 5 = Z

K + 5 = P, R + 5 = W, X + 5 = C

Option (c): # = HYU, % = PWC (Not Follow)​

H + 5 = M, Y + 5 $$\neq$$​ T, U + 5 = Z

K + 5 = P, R + 5 = W, X + 5 = C

Option (d): # = HOU, % = PWC (Follow)​

H + 5 = M, O + 5 = T, U + 5 = Z

K + 5 = P, R + 5 = W, X + 5 = C

Thus, correct option is (d).